Background material on work, energy and power.Physical work and work in physics. dW = F.ds = Fds cosθ. Pulleys and energy. The work energy theorem and the definition of kinetic energy. Kinetic energy and stopping distances. Storing energy: potential energy in a gravitational field or a spring. Conservative and non-conservative forces: examples. Conservation of mechanical energy. Power as the rate of doing work or the rate of converting energy. Units and examples. Using energy and power in mechanics problems. Includes